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Photocatalytic Degradation of Rhodamine B by Recyclable Ag Br/Polypyrrole(PPy)Nano-Catalysts

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1198-1204页

作者： yIN Xiaogang liU Xinyun li Hang WU Huimin FU Hai GONG Wei Key Laboratory of Functional Materials Chemistry of Gui Zhou Province School of Chemistry and Materials ScienceGui Zhou Normal UniversityGuiyang 550001China School of Pharmaceutical Sciences Guizhou Medical UniversityGuiyang 550025China

We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)*** PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAB)as both the soft-templating agent and the bromine source,a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis *** synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and AgBr led to increased thermal *** combination of PPy and AgBr was observed through XRD and XPS *** the morphology study,the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM *** the photodegradation experiments,up to 92%rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV *** catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test.

关键词： polypyrrole AgBr photocatalysts rhodamine B

CO_(2)hydrogenation to methanol promoted by Cu and metastable tetragonal Ce_(x)Zr_(y)O_(z) interface

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Journal of Energy Chemistry 2022年第5期31卷 771-779页

作者： Na li Weiwei Wang lixin Song Hui Wang Qiang Fu Zhenping Qu Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024LiaoningChina State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Designing effective catalyst to improve the activity of CO_(2) hydrogenation to methanol is a potential avenue to realize the utilization of CO_(2) resources. Herein we construct three kinds of Cu/Ce_(x)Zr_(y)O_(z)(CCZ) catalysts with different crystal phases of Ce_(x)Zr_(y)O_(z)solid solutions, which demonstrate distinct activity and methanol selectivity in the order of metastable tetragonal-CCZ(CCZ-t’’, parts of oxygen in Ce_(x)Zr_(y)O_(z) were replaced by tetragonal phase from cubic fluorite phase) > tetragonal-CCZ(CCZ-t) > cubic-CCZ(CCZ-c) for CO_(2) hydrogenation to methanol. Structural analysis reveals that oxygen vacancies, surface hydroxyls and unsaturated Cu species of CCZ all follow the same sequence as that of activity and methanol selectivity,indicating that the above features are beneficial to improve the catalytic reaction *** programmed experiments and mechanism studies show that the interface between Cu and tetragonal(t and t’’) Ce_(x)Zr_(y)O_(z) can promote CO_(2) adsorption, and the adsorbed CO_(2) is more reactive and can generate active bidentate carbonate species, which can be hydrogenated to form active monodentate and bidentate formate species under CO_(2) and H_(2) atmosphere. These intermediates should be crucial to the formation of methanol product. CCZ-t’’has stronger H_(2) activation ability than CCZ-t, which makes the former catalyst have more intermediates and higher methanol selectivity. In contrast, CO_(2) mainly adsorbs on cubic Ce_(x)Zr_(y)O_(z) support of CCZ-c, but its H_(2) spillover ability is low, which hinders the reaction process. In addition, the strong adsorption of surface intermediates on CCZ-c is also not conducive to methanol formation. Results here demonstrate that constructing active Cu-support interfaces may be an important approach to design effective catalyst for CO_(2)hydrogenation.

关键词： CO_(2)hydrogenation Methanol Copper Cerium zirconium solid solution Interface

探索脓毒症患者最佳脉搏血氧饱和度范围:一项基于MIMIC-Ⅳ数据库的回顾性研究

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中华危重病急救医学 2024年第8期36卷 813-820页

作者：叶渊文李飞飞杨宝华林连根陈玲珑温州市人民医院急诊科浙江温州325000

目的探索脓毒症患者住院期间最佳脉搏血氧饱和度(SpO_(2))范围。方法采用病例-对照研究设计。提取美国重症监护医学信息数据库Ⅳ(MIMIC-Ⅳ)脓毒症患者人口统计学信息、生命体征、合并症、实验室参数、危重症评分、临床治疗信息和临床结... 详细信息

目的探索脓毒症患者住院期间最佳脉搏血氧饱和度(SpO_(2))范围。方法采用病例-对照研究设计。提取美国重症监护医学信息数据库Ⅳ(MIMIC-Ⅳ)脓毒症患者人口统计学信息、生命体征、合并症、实验室参数、危重症评分、临床治疗信息和临床结局等资料。采用广义加性模型(GAM)结合Loess平滑函数,分析并可视化脓毒症患者住院期间SpO_(2)与院内全因病死率的非线性关系,确定最佳SpO_(2)范围,然后利用Logistic回归模型和Kaplan-Meier生存曲线验证SpO_(2)与院内全因病死率的关联性。结果共纳入5937例脓毒症患者,其中1191例(20.1%)在住院期间死亡。GAM分析显示,脓毒症患者住院期间SpO_(2)与院内全因病死率存在非线性关系,呈"U"型曲线,当SpO_(2)在0.96~0.98时病死率最低。经过多因素调整的Logistic回归模型进一步证实,住院期间SpO_(2)在0.96~0.98的患者病死率低于SpO_(2)0.98的患者(高氧组,OR=1.594,95%CI为1.337~1.900,P0.98的患者(Log-Rank检验:χ^(2)=113.400,P0.98的患者明显降低。结论脓毒症患者住院期间SpO_(2)水平与院内全因病死率呈"U"型曲线关系,即高氧与低氧均与死亡风险增加有关,且确定最佳SpO_(2)范围为0.96~0.98。

关键词：脓毒症脉搏血氧饱和度院内病死率最佳范围氧疗

Oxide dispersion strengthened stainless steel 316L with superior strength and ductility by selective laser melting

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Journal of Materials Science & Technology 2020年第7期42卷 97-105页

作者： yuan Zhong Leifeng liu Ji Zou Xiaodong li Daqing Cui Zhijian Shen Department of Materials and Environmental Chemistry Arrhenius LaboratoryStockholm UniversitySE-10691 StockholmSweden School of Metallurgy and Materials University of BirminghamB152TT UK Department of Chemistry-Radiochemistry P.O.Box 55FI-00014 University of HelsinkiFinland

Dense oxide dispersion strengthened(ODS) 316 L steels with different amount of y2O3 additions were succe s s fully fabricated by selective laser melting(SLM) even though part of the added y2O3 got lost during the *** microstructure was characterized in details and the mechanical properties were tested at room temperature,250℃ and 400℃,*** effect of the scanning speed on agglomeration of nanoparticles during SLM process was *** properties,e.g.,yield strength of 574 MPa and elongation of 91%,were achieved at room temperature in SLM ODS 316 L with additional 1% of y2 *** elevated temperature s,the strength kept high but the elongations dropped dra *** was observed that nano-voids nucleated throughout the whole gauge section at the sites where nanoinclusions *** growth and coalescence of these voids were suppre s sed by the formation of an element segregation network before necking,which relieved local stress concentration and thus delayed *** unusual necking behavior was studied and compared to the previous *** appeared that the strong convection presented in the melt pool can evenly redistribute the short-time milled coarse y2O3 precursor powder during SLM *** findings can not only solve the problems encountered during the fabrication of ODS components but also replenish the strengthening mechanism of SLM 316 L thus pave a way for further improving of mechanical properties.

关键词： ODS steel Selective laser melting(SLM) Elevated-temperature properties Necking Strain hardening

Nano-STING agonist-decorated microrobots boost innate and adaptive anti-tumor immunity

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Nano Research 2023年第7期16卷 9848-9858页

作者： yixin Wang Zhaoting li yu Chen Allie Barrett Fanyi Mo Quanyin Hu Pharmaceutical Sciences Division School of PharmacyUniversity of Wisconsin-MadisonMadisonWI 53705USA Carbone Cancer Center School of Medicine and Public HealthUniversity of Wisconsin-MadisonMadisonWI 53705USA Wisconsin Center for NanoBioSystems School of PharmacyUniversity of Wisconsin-MadisonMadisonWI 53705USA

Activating the cyclic guanosine monophosphate-adenosine monophosphate synthase/stimulator of interferon genes(cGAS/STING)signaling has emerged as a promising anti-tumor strategy due to the important role of the pathway in innate and adaptive immunity,yet the selective delivery of STING agonists to tumors following systemic administration remains ***,we develop a nano-STING agonist-decorated microrobot platform to achieve the enhanced anti-tumor *** ions and the STING agonist 2’3’-cyclic guanosine monophosphate-adenosine monophosphate(cGAMP)are co-encapsulated in the mitochondria-targeting nanoparticles(mTNPs),which can trigger the release of mitochondrial DNA(mtDNA)by Fenton reactioninduced mitochondria oxidative *** exogenous cGAMP and the endogenous mtDNA can work synergistically to induce potent cGAS/STING signaling ***,we decorate mTNPs onto Salmonella typhimurium VNP20009(VNP)bacteria to facilitate tumor accumulation and deep *** demonstrate that the systemic administration of this microrobot activates both innate and adaptive immunity,improving the immunotherapeutic efficacy of the STING agonists.

关键词： drug delivery mitochondrial DNA(mtDNA) Fenton reaction stimulator of interferon genes(STING) tumor immunotherapy bacteria

Functionalized alginate-based bioinks for microscale electrohydrodynamic bioprinting of living tissue constructs with improved cellular spreading and alignment

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Bio-Design and Manufacturing 2023年第2期6卷 136-149页

作者： Zhennan Qiu Hui Zhu yutao Wang Ayiguli Kasimu Dichen li Jiankang He State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China NMPA Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi’an Jiaotong UniversityXi’an 710049China

Bioprinting has been widely investigated for tissue engineering and regenerative medicine ***,it is still difficult to reconstruct the complex native cell arrangement due to the limited printing resolution of conventional bioprinting techniques such as extrusion-and inkjet-based ***,an electrohydrodynamic(EHD)bioprinting strategy was reported for the precise deposition of well-organized cell-laden constructs with microscale filament size,whereas few studies have been devoted to developing bioinks that can be applied for EHD bioprinting and simultaneously support cell *** study describes functionalized alginate-based bioinks for microscale EHD bioprinting using peptide grafting and fibrin incorporation,which leads to high cell viability(>90%)and cell *** printed filaments can be further refined to as small as 30μm by incorporating polyoxyethylene and remained stable over one week when exposed to an aqueous *** utilizing the presented alginate-based bioinks,layer-specific cell alignment along the printing struts could be observed inside the EHD-printed microscale filaments,which allows fabricating living constructs with cell-scale filament resolution for guided cellular orientation.

关键词： Microscale electrohydrodynamic bioprinting Alginate-based bioinks Cell spreading Cell alignment

Effects of Ru on microstructure stability and mechanical properties of Ni3Al single crystal alloy

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Progress in Natural Science:Materials International 2011年第4期21卷 286-292页

作者： Shu-suo li,Xiao-ying XIE,li-wu JIANG,ya-fang HAN School of Materials Science and Engineering,Beihang University,Beijing 100191,China School of Materials Science and Engineering Beihang University Beijing 100191 China

The effect of Ru on microstructure stability and stress rupture properties of a Ni3Al single-crystal alloy was investigated. The experimental results showed that the addition of 2%Ru(mass fraction) improved the microstructure stability due to the restraint of harmful y-NiMo phase formation during the thermal exposure at the high temperature above 1 000℃.And the reason may be that the addition of Ru increased the degree of Mo supersaturation in bothγandγ’ phases,and hence suppressed the precipitation of y-NiMo *** results of stress rupture tests under the testing condition of 1100℃,120 MPa showed that the addition of 2% Ru in the alloy improved the stress rupture lives significantly for thermal exposed *** improvement of the stress rupture properties may be attributed to the restraint of y-NiMo phase precipitation and growth by the addition of the proper amount Ru.

关键词： Ni3Al microstructure stability Ru y-NiMo phase stress rupture

Enhancing li NiO_(2) cathode materials by concentration-gradient yttrium modification for rechargeable lithium-ion batteries

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Journal of Energy Chemistry 2021年第12期30卷 312-319,I0007页

作者： yudong Zhang Hang li Junxiang liu Jiuding liu Hua Ma Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Engineering Research Center of High-efficiency Energy Storage(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China Tianjin EV Energies Company limited(JEVE) Tianjin 300380China

lithium nickel oxide(liNiO_(2)) cathode materials are featured with high capacity and low cost for rechargeable lithium-ion batteries but suffer from severe interface and structure *** we report that rationally designed liNiO_(2) via concentration-gradient yttrium modification exhibits alleviative side reactions and improved electrochemical *** liNiO_(2) cathode with liyO_(2)-y_(2) O_(3) coating layer delivers a discharge capacity of 225 mAh g^(-1) with a high initial Coulombic efficiency of 93.4%.These improvements can be attributed to the formation of in-situ modified hybrid liyO_(2)-y_(2 O3) coating layer,which suppresses phase transformation,electrolyte oxidation and salt dissociation due to the formation of protective cathode electrolyte *** results indicate promising application of concentration-gradient yttrium coating as a facile approach to stabilize nickel-rich cathode materials.

关键词： lithium-ion battery Concentration gradient Nickel-rich cathode Surface coating yttrium oxide

补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效

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中成药 2024年第2期46卷 458-465页

作者：杨晔颖何东仪薛鸾于盈盈程鹏孙宇苏励上海中医药大学附属龙华医院上海200032 上海光华中西医结合医院上海200030 上海中医药大学附属岳阳中西医结合医院上海200437 青浦区中医医院上海201700

目的探讨补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效。方法 167例患者随机分为对照组(常规治疗,55例)、暴露组(常规治疗+补肾活血汤剂,54例)、高暴露组(常规治疗+补肾活血汤剂+补肾活血膏方,58例),疗程2年。检测临床疗效、BA... 详细信息

目的探讨补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效。方法 167例患者随机分为对照组(常规治疗,55例)、暴露组(常规治疗+补肾活血汤剂,54例)、高暴露组(常规治疗+补肾活血汤剂+补肾活血膏方,58例),疗程2年。检测临床疗效、BASDAI评分、ASDAS-CRP、BASFI评分、脊柱痛评分、PGA评分、BASMI评分、ASQoL评分、SPARCC评分、肾虚血瘀证评分、ESR、CRP、IL-6、TNF-α、IL-17、IL-23、IL-35、NLR、PLR、安全性指标变化。结果高暴露组ASAS40、ASAS5/6、BASDAI50例数多于暴露组和对照组(P<0.05)。治疗后,高暴露组BASDAI评分、ASDAS-CRP、BASFI评分、脊柱痛评分、PGA评分、BASMI评分、SPARCC评分、ASQoL评分、肾虚血瘀证评分、ESR、CRP、IL-6、TNF-α、IL-17、IL-23低于其他2组(P<0.05),IL-35更高(P<0.05)。经Logistic回归分析校正混杂因素后,补肾活血汤、补肾活血膏方降低BASDAI评分和ASDAS-CRP(P<0.05),提高临床疗效(P<0.05)。3组未发现严重不良反应。结论补肾活血膏方可安全有效地抑制肾虚血瘀证强直性脊柱炎患者炎症,降低疾病活动度,减轻骨髓水肿,改善临床症状,提高关节功能和生活质量。

关键词：补肾活血膏方常规治疗补肾活血汤强直性脊柱炎肾虚血瘀